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p-30=2p-78
We move all terms to the left:
p-30-(2p-78)=0
We get rid of parentheses
p-2p+78-30=0
We add all the numbers together, and all the variables
-1p+48=0
We move all terms containing p to the left, all other terms to the right
-p=-48
p=-48/-1
p=+48
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